From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A922DC10F14 for ; Thu, 3 Oct 2019 15:56:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7EE4221D81 for ; Thu, 3 Oct 2019 15:56:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570118187; bh=xVnqa8oy56HQ1o0nv3jNb85HbXSpjVFmjg9sZlCBZws=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=H6VwiBRLNG9DGoEr1XeFQyR94sPP+erbhgpCnfRvVpakEZlgQBPqE8w63JZAwviVA Rqjf+SLtAkLdPud1Q0+VCFSR0G8VjhTqdrqyojPWMtYz8WYBHspF4C5T1dpH8rMip8 uCvgfakARjY144ow1vRrb+Mv04iPqpIvB8OOb++0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730592AbfJCP4Y (ORCPT ); Thu, 3 Oct 2019 11:56:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:38042 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730541AbfJCP4Q (ORCPT ); Thu, 3 Oct 2019 11:56:16 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8906921848; Thu, 3 Oct 2019 15:56:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570118174; bh=xVnqa8oy56HQ1o0nv3jNb85HbXSpjVFmjg9sZlCBZws=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TE32caY8yc1e89Jtp9ulhy3fZ/Iu1sSTQpxfkvh0ejyouw9zt8iB4ygakChQCsIVa wBVH/w81DjlJXHgeUVA3DC1COylMJqwVgnE94fzuutTIMXDQOtZw0371SGN02ey4rs D7v1LahmRrhHSLGhu8Eoo2/EjSHZWzqlG/c0jdDo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chao Yu , Jaegeuk Kim , Sasha Levin Subject: [PATCH 4.4 17/99] f2fs: fix to do sanity check on segment bitmap of LFS curseg Date: Thu, 3 Oct 2019 17:52:40 +0200 Message-Id: <20191003154302.103100907@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191003154252.297991283@linuxfoundation.org> References: <20191003154252.297991283@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Chao Yu [ Upstream commit c854f4d681365498f53ba07843a16423625aa7e9 ] As Jungyeon Reported in bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203233 - Reproduces gcc poc_13.c ./run.sh f2fs - Kernel messages F2FS-fs (sdb): Bitmap was wrongly set, blk:4608 kernel BUG at fs/f2fs/segment.c:2133! RIP: 0010:update_sit_entry+0x35d/0x3e0 Call Trace: f2fs_allocate_data_block+0x16c/0x5a0 do_write_page+0x57/0x100 f2fs_do_write_node_page+0x33/0xa0 __write_node_page+0x270/0x4e0 f2fs_sync_node_pages+0x5df/0x670 f2fs_write_checkpoint+0x364/0x13a0 f2fs_sync_fs+0xa3/0x130 f2fs_do_sync_file+0x1a6/0x810 do_fsync+0x33/0x60 __x64_sys_fsync+0xb/0x10 do_syscall_64+0x43/0x110 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The testcase fails because that, in fuzzed image, current segment was allocated with LFS type, its .next_blkoff should point to an unused block address, but actually, its bitmap shows it's not. So during allocation, f2fs crash when setting bitmap. Introducing sanity_check_curseg() to check such inconsistence of current in-used segment. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/segment.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 6802cd754eda0..e482cca005a61 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -2262,6 +2262,41 @@ static int build_dirty_segmap(struct f2fs_sb_info *sbi) return init_victim_secmap(sbi); } +static int sanity_check_curseg(struct f2fs_sb_info *sbi) +{ + int i; + + /* + * In LFS/SSR curseg, .next_blkoff should point to an unused blkaddr; + * In LFS curseg, all blkaddr after .next_blkoff should be unused. + */ + for (i = 0; i < NO_CHECK_TYPE; i++) { + struct curseg_info *curseg = CURSEG_I(sbi, i); + struct seg_entry *se = get_seg_entry(sbi, curseg->segno); + unsigned int blkofs = curseg->next_blkoff; + + if (f2fs_test_bit(blkofs, se->cur_valid_map)) + goto out; + + if (curseg->alloc_type == SSR) + continue; + + for (blkofs += 1; blkofs < sbi->blocks_per_seg; blkofs++) { + if (!f2fs_test_bit(blkofs, se->cur_valid_map)) + continue; +out: + f2fs_msg(sbi->sb, KERN_ERR, + "Current segment's next free block offset is " + "inconsistent with bitmap, logtype:%u, " + "segno:%u, type:%u, next_blkoff:%u, blkofs:%u", + i, curseg->segno, curseg->alloc_type, + curseg->next_blkoff, blkofs); + return -EINVAL; + } + } + return 0; +} + /* * Update min, max modified time for cost-benefit GC algorithm */ @@ -2350,6 +2385,10 @@ int build_segment_manager(struct f2fs_sb_info *sbi) if (err) return err; + err = sanity_check_curseg(sbi); + if (err) + return err; + init_min_max_mtime(sbi); return 0; } -- 2.20.1